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Condensed Parent Information, Balance Sheets (FY) (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
ASSETS          
Cash $ 170,235,110 $ 113,026,884 $ 82,835,426 $ 68,748,308 $ 79,964,633
Other assets 12,665,515 13,232,247   9,508,899  
Total assets 2,062,231,972 1,720,770,682   1,062,456,285  
LIABILITIES AND STOCKHOLDERS' EQUITY          
Total liabilities 1,814,745,395 1,514,918,842   957,216,145  
Stockholders' equity 247,486,577 205,851,840 $ 134,734,011 105,240,140 100,176,859
Total liabilities and shareholders' equity $ 2,062,231,972 1,720,770,682   1,062,456,285  
Parent [Member]          
ASSETS          
Cash   3,936,000   2,068,000 $ 503,000
Investment in subsidiaries   168,104,000   100,023,000  
Other assets   42,766,000   4,392,000  
Total assets   214,806,000   106,483,000  
LIABILITIES AND STOCKHOLDERS' EQUITY          
Other liabilities   (1,046,000)   1,243,000  
Other borrowings   10,000,000   0  
Total liabilities   8,954,000   1,243,000  
Stockholders' equity   205,852,000   105,240,000  
Total liabilities and shareholders' equity   $ 214,806,000   $ 106,483,000